<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card >
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数" 
                type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联对话框-->
                    <el-cascader
                        expand-trigger="hover"
                        v-model="selectedCateKeys"
                        :props="cateProps"
                        :options="cateList"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button type="primary" size="mini" 
                        :disabled="isBtnDisabled" @click="AddDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" 
                                    size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性按钮 -->
                    <el-button type="primary" size="mini" 
                    :disabled="isBtnDisabled" @click="AddDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" 
                                    size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加' + titleText"
            :visible.sync="AddDialogVisible"
            width="50%" @close="addDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
                        label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改' + titleText"
            :visible.sync="editDialogVisible"
            width="50%" @close="editDialogClosed">
            <!-- 修改参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" 
                        label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                childrent:'children'
            },
            // 级联选择框双向邦写到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数数据
            manyTableData:[],
            // 静态参数数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            AddDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
                },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
            },
            // 控制修改添加对话框的显示与隐藏
            editDialogVisible:false,
            // 修改参数的表单数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
            },
            // 控制按钮与文本框的切换显示
            inputVisible:false,
            // 文本框中输入的内容
            inputValue:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const{data:res} = await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error("获取商品分类参数失败!")
            }
            this.cateList=res.data
            // console.log(this.cateList)
        },
        // 级联选择框选中项变化,会触发这个方法
        handleChange(){
            this.getParamsData()
        },
        // Tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
            console.log(this.activeName)
        },
        // 获取参数的列表数据
        async getParamsData(){
            // console.log(this.selectedCateKeys)
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            // 证明选中的是三级分类
            console.log(this.selectedCateKeys)
            // 根据所选分类的Id,和当前所处的面板，获取对应的参数
            const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error("获取参数列表失败！")
            }            
            res.data.forEach(item=>{
                item.attr_vals = item.attr_vals
                    ?item.attr_vals.split(' ')
                    :[]
                // 控制文本框的显示与隐藏
                item.inputVisible=false;
                // 文本框中输入的值
                item.inputValue=''
            })
            console.log(res.data)
            if(this.activeName==="many"){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮,添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return
                const{data:res} =await this.$http.post(`categories/${this.cateId}/attributes`,
                {
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error("添加参数失败!")
                }
                this.$message.success('添加参数成功!')
                this.AddDialogVisible=false
                this.getParamsData()
            })
        },
        // 点击按钮,展示修改的对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const{data:res} =await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {
                params:{attr_sel:this.activeName}
            })
            if(res.meta.status!==200){
                this.$message.error('获取参数信息失败')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid)return
                const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {attr_name:this.editForm.attr_name,
                attr_sel:this.activeName})
                if(res.meta.status!==200){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        // 根据Id删除对应的参数项
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err=>err)

            // 用户取消了删除操作
            if(confirmResult!=='confirm'){
                return this.$message.info('已取消删除！')
            }
            //删除业务逻辑
           const{data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
           if(res.meta.status!==200){
               return this.$message.error('删除参数失败！')
           }
           this.$message.success('删除参数成功！')
           this.getParamsData()
        },
        // 文本框失去焦点，或按下了Enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            // 如果没有return,则证明输入的内容,需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false

            // 需要发起请求,保存这次请求
            this.saveAttrVals(row)
        },
        // 将attr_vals的操作,保存到数据库
        async saveAttrVals(row){
            // 需要发起请求,保存这次请求
            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                        {
                            attr_name:row.attr_name,
                            attr_sel:row.attr_sel,
                            attr_vals:row.attr_vals.join(' ')
                        })
            if(res.meta.status!==200){
                this.$message.error('修改参数项失败!')
            }
            this.$message.success('修改参数项成功!')
        },
        // 点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible=true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上的元素被重新渲染后，
            // 才会执行回调函数中的代码
             this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        // 如果按钮需要被禁用，则返回true 否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题文本
        titleText(){
            if(this.activeName==="many"){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin:15px 0;
}

.el-tag{
    margin:5px;
}

.input-new-tag{
    width:120px;
}
</style>